Hole guide for drill steels



Jilly C.-C. HANSEN HOLE GUIDE FOR DRILL STEELS Filed Oct; 5, 1925 IN VEN TOR U12 arl; GHmwegz Patented July 6,

' U I D TAT S PA E T j C 1 CHARLES C. HANsEN, 0F' EAS,TON,,IP ENNSYLV:A1\T IA, AssIenon-To"inGEnsoLL RANn 7 COMPANY, 0E JERSEY CITY, NEW JERSEY, A ooaroEA'rIon 'oEN WiJEnsEx,

HOLE GUIDE Eon" DRILL s'i'EELs A Application filed October5, 1925. Serial Noi fiO,402.

from rifling the drill hole and sticking espe-j 'cially, if'he is drilling in brecciated ground or if the rock itself is'of an'uneven character and hardness- -Also in drilling deep horizontal holes it is veryhard to maintain alignment-between the drill steel and the drill, due to the loose fit in the drill chuck and the fact that the diameter of the. drill hole inthe first two feet may be two inches greater than the diameter of the'drill hole at a depth of eighteen or twenty feet, with the result that a long steel receives no support from the walls of the-hole where the support "is most needed and bends between the end of the hole and the drill chuck. In this case. the operator is .often tempted to secure j alignment by changing the position of the l V rifles his hole when drilling is resumed. 1

drill itself with the result that he quickly The object of this'inventiofi is to overcome these difficulties by providing a cheap,

' 7 practical guide for the drill steel which'will hold the steel concentrielwith the bore of the hole and prevent rifling and the resultant sticking of the steel,"or if usedasa remedy instead of a preventative after a steel, has become stuck will help to loosen 'it and will guide it back into' its proper course.

At the same time,it does not close up the hole and thus prevent the-escape of the water and cuttings.

.7 .My invention consists ofthe elementsset forth in the appended claims, described in the specification and illustratedin the ac companying drawings in which,

Figure 1 1s a horizontal sectlonalview of a drill hole containinga drill'steel and the drill steel guide'in position, and V Figure 2 is a cross-seotionalview of the same alongthe line v22 in Figure 1 look ing in the direction of the arrows. 7 Referring .to the drawings a drill steel A is in position to drill in a hole B. J The steel and the: hole maybe of vany depth,preferably however of a depth greater than two feet and up to thirt feet for instance.

With the drill steel A as been inserted the hind or hold the 'drill'steel,

- plank for suspending steel" guide This is preferably an iron or-steel forging inthis instance consisting j guide piece or head D partly encircling the of three main portions z-Ea semi-cylindrical arm is bent preferably atright angles at F and a point or spike is formed at G for en gagement with a blockof wood H. By the fuse of wooden blocks the said gzguidefhead canbe either lowered or raised with relation to the drilling-bit K on the steel A;

: .nIn operation the guiding head D should if he six'or eight inches from the bit, andseveral' guides of different lengths should be provided" for drilling a deep hole.

I am notto be understood as limiting my steel, guide to'the exact form disclosed in w the drawings, particularly in the matter of means for suspending the guide piece inlthe hole. Obviously in horizontal or'up-drill ing the spikeG could not be used and some form of handle or flat plate would be preferable. Also, in the jmatter of cross-sectional shape of the guide head D as shown 1 1n Figure 2, the preferable form has the" while at the same. timethe guidedoes not Other Variations'm'aybe Means "for guiding a rock drill steel in drilling operations. consisting of a semicyllndrical head or guide adapted to fit :bevelededges J' which'giv'e the guide head -more support, from the bore of {the hole possible und'er special circum- V loosely around the drill steel, a rod integral with sald guide and adapted to fit loosely between the said drill steel and thebore of:

795 the hole, and'a pointorfspikeonthe endfof the rod opposite to thevguide, said spike being, adapted to engagewith a block or thedevice at apredetermined depth in the drillholeand for holding the said device against rotation. v

In testimony whereof I havefsigned this if specification; V a 

